|Quadrangle map, 1:250,000-scale||SM|
|Quadrangle map, 1:63,360-scale||D-4|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The Two Genevieves prospect is on an east-facing bluff overlooking Cribby Creek, about 2.5 miles north of the Kuskokwim River. The prospect is at an elevation of about 730 feet, about 0.6 mile south-southeast of the center of section 18, T. 20 N., R. 44 W., of the Seward Meridian. The location is accurate within about 0.3 mile.|
Geologic descriptionAt the Two Genevieves prospect, an altered mafic sill largely composed of silica, mariposite, and carbonate minerals intrudes sandstone and shale of the Upper Cretaceous, Kuskokwim Group (Cady and others, 1955). Cinnabar and fragments of graphite occur in vugs and in a breccia zone in the upper part of the altered sill. According to Cady and others (1955), the Two Genevieves prospect is one of the few occurrences of graphite associated with cinnabar known in the Aniak district.
|Geologic map unit||(-157.320600158886, 61.8154608243529)|
|Mineral deposit model||Silica-carbonate mercury (Cox and Singer, 1986; model 27c).|
|Mineral deposit model number||27c|
|Alteration of deposit||Mafic sill altered to secondary silica, mariposite, and carbonate.|
|Workings or exploration||Only surface sampling and evaluation has taken place, mostly prior to 1952 (Cady and others, 1955; Cobb, 1976 [OFR 76-605]).|
|Indication of production||None|
Cady, W.M., Wallace, R.E., Hoare, J.M., and Webber, E.J., 1955, The central Kuskokwim region, Alaska: U.S. Geological Survey Professional Paper 268, 132 p.
Cobb, E.H., 1972, Metallic mineral resources map of the Sleetmute quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-368, 1 sheet, scale 1:250,000.
Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Dillingham, Sleetmute, and Taylor Mountains quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-606, 92 p.
Gray, J.E., Gent, C.A., Snee, L.W., and Wilson, F.H., 1997, Epithermal mercury-antimony and gold-bearing vein lodes of southwest Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 287-305
Miller, M.L., Belkin, H.E., Blodgett, R.B., Bundtzen, T.K., Cady, J.W., Goldfarb, R.J., Gray, J.E., McGimsey, R.G., and Simpson, S.L., 1989, Pre-field study and mineral resource assessment of the Sleetmute quadrangle, southwestern Alaska: U.S. Geological Survey Open-File Report 89-363, 115 p., 3 plates, scale 1:250,000.
Sainsbury, C.L., and MacKevett, E.M., Jr., 1965, Quicksilver deposits of southwestern Alaska a description of the quicksilver mines and prospects, with special emphasis on the structural controls of ore deposition: U.S. Geological Survey Bulletin 1187, 89 p.
Wells, J.T., and Ghiorso, M.S., 1988, Rock alteration, mercury transport, and metal deposition at Sulphur Bank, California: Economic Geology, vol. 83, p. 606-618.
White, D. E., and Robinson, C. E., 1962, Sulphur Bank, California, a major hot spring quicksilver deposit, in Engel, A.E.J., James, H.L., and Leonard, B.F., eds., Petrologic studies: A volume in honor of A.F. Buddington: Boulder, Colorado, Geological Society of America p. 397-428.
|Reporters||T.K. Bundtzen (Pacific Rim Geological Consulting, Inc.) and M.L. Miller (U.S. Geological Survey)|
|Last report date||4/30/2003|